Direct acting internal combustion air compressor



Feb. 14, 1933. Esc 1,897,674

DIRECT ACTING INTERNAL COMBUSTION AIR COMPRESSOR Filed Aug. 18, 1950Patented Feb. 14, 1933 PATENT OFFICE RAUL PATERAS PESCARA, OF PARIS,

FRANCE DIRECT ACTING INTERNAL COMBUSTION AIR COMPRESSOR Applicationfiled August 18, 1930, Serial No.476,110, and in Germany August 17,1929.

The invention is relative to a scavenging process for two-strokemotor-compressors of the type having interconnected but otherwise freepistons movable in opposite diretrons.

The principal object of my invention is to simplify the construction ofthe machines 0 the type indicated by eliminating some of the accessoryelements which serve to compress the scavenging air.

According to the the invention the first part only of each workingstroke in the actual compressor cylinder or cylinders is \llllllZQLl forthe compression of the air intended for scavenging, which scavenging airis compressed into a reservoir for the purpose. The scavenging airpasses through openings disposed in the walls of the cylinders into atank or reservoir, which openings are disposed in such wise that theyare covered by the compressor pistons as soon as the quantity of airnecessary for scavenging is compressed into the tank.

The invention consists in addition of rertain other structureshereinafter pointed out.

The invention likewise includes all embodiments thereof and in generalall machines corresponding to the said structures as well as theirspecial elements necessitated thereby.

In the accompanying drawing the single figure is a lengthwise sectionthrough a motor compressor of the two-cycle type having interconnectedbut other wise free pistons movable in opposite dire;tions and directacting.

Referring to the drawing more in detail, the motor includes two freepistons 1 and 2, movable in a motor cylinder 3 and in the compressorcylinders 4 and 5 in opposite directions. The two pistons are connectedtogether by means of a synchronizing device consisting of links (3connected to an oscillating lever 8 adapted to describe an angle of lessthan 180 about a shaft 7. The piston 2 controls at one of theextremities of the motor cylinder the exhaust ports 9 and the piston 1at the other extremity controls the admission ports 10.

The free pistons 1 and 2 carry on the compressor side the admissionvalves 11 and they push back the air compressed in the compressorcylinders 1 and 5 which leaves by the orifices 12 through the checkvalves 13 and passes into the scavenging air tank 14: and leaves by thecheck valves pressed air tank through conduit 16. The cushions ofresidual compressed air which remain in the two compressor cylinders 4and 5 send the pistons back to their inner dead point. Scavenging takesplace through scavenging orifices 10 which are opened to allow thescavenging air to flow from tank 14 into the motor cylinder 3 throughthe conduit 17 and fills the said cylinder with fresh air, which blowsthe burned gases out through the exhaust orifices 9 into the exhaustpipe 18.

The operation of the above described device is as follows By separatingfrom their internal dead point as illustrated in the drawing, thepistons 1 and 2 determine a pressure in the compressed air tank 14 whichis contiguous with the cylinder. The pistons 1 and 2 compress byseparating from each other, and consequently during the power stroke,the air in the compressor cylinders 4 and 5 is compressed and during thefirst part of the said stroke, part of the contents of the compressorcylinder is forced through the ports 12 and the check valves 1?) intothe tank 14. The openings 12 are disposed in such a way that when thepistons 1 and 2 cover them the pressure in the tank 11 is that necessaryfor scavenging. The check valves 13 oppose the return of the air intothe cylinder through conduit 12, said air remains therefore underpressure until the free piston 1 will have uncovered the opening 10, thescavenging air then escapes through the pipe 17 and the motor cylinder 3and the pressure drops in the tank 11 until the free piston covers thescavenging orifices anew. After passing ports 12 during the powerstroke, the compressed air is forced through the valve 15 to theconduits 16 to the reservoir for the cone ressed air.

\Vhat I claim and desire to secure by Letters Patent of the UnitedStates of America is 1. In a motor compressor of the type described, aplurality of compressing cylinders, aoommon motor cylinder coaxiallydisposed 15 to the com- 1 the tor cylinder, the compressing cylinders hcompressed air at the ends t ereof remote from the motor posiend of thepower stroke, the exhaust openings being the other piston in thecommunication through the said conduit and inlets between the reservoirthe motor cylinder being maintained closed by one of the pistons in themotor cylinder until it attains the position towards the end of thepower stroke, the ex iaust openings being maintained closed by herpiston in the motor cylinder until said other piston also attains aposition towards the end rangement being such that compressing cylindersat the first part of the power stroke is driven through the intermediate outlets into the reservoir, after which the said intermediateoutlets are closed by the urther movement ot the pistons, the comthereservoir passing thererom into the motor cylinder to effect thescavenging of said cylinder when the pistons approach the ends of thepower stroke, one of the said pistons uncovering the exhaust ports ofthe power stroke, the ar-.

In Witness whereof I RAUL PATE attix m RAS y signature.

PESCARA.

